package com.fqgj.sentry.policy.engine.eval.triple;

import com.fqgj.sentry.policy.engine.utils.Utils;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

@Component
public class SpringContextUtil implements ApplicationContextAware{

    // Spring应用上下文环境
    private static ApplicationContext applicationContext;

    /**
     * 实现ApplicationContextAware接口的回调方法，设置上下文环境
     *
     * @param applicationContext
     */
    public void setApplicationContext(ApplicationContext applicationContext) {
        SpringContextUtil.applicationContext = applicationContext;
    }

    public static String getContextBeans() {
        String[] names = applicationContext.getBeanDefinitionNames();
        return Utils.toJsonString(names);
    }

    /**
     * @return ApplicationContext
     */
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    /**
     * 获取对象
     * 这里重写了bean方法，起主要作用
     * @param name
     * @return Object 一个以所给名字注册的bean的实例
     * @throws BeansException
     */
    public static Object getBean(String name) throws BeansException {
        return applicationContext.getBean(name);
    }


    /**
     *
     * @param name
     * @param requiredType
     * @param <T>
     * @return
     */
    public static <T> T getBean(String name, Class<T> requiredType) throws BeansException {
        return applicationContext.getBean(name, requiredType);
    }

    /**
     *
     * @param name
     * @return
     */
    public static boolean containsBean(String name) {
        return applicationContext.containsBean(name);
    }

    /**
     *
     * @param name
     * @return
     */
    public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException {
        return applicationContext.isSingleton(name);
    }

    /**
     *
     * @param name
     * @return
     */
    public static Class<? extends Object> getType(String name) throws NoSuchBeanDefinitionException {
        return applicationContext.getType(name);
    }
}
